Af testing current status and perspectives
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AF Testing Current Status and Perspectives. Octavio Medina Julio Orozco ENSTB / IRISA. TF-NGN meeting Southampton, UK 18/04/2002. Current Status. What has been done: Calibration of WRED Calibration of TCM for TCP What has been tested: BW distribution among UDP flows

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AF Testing Current Status and Perspectives

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Af testing current status and perspectives

AF TestingCurrent Status and Perspectives

Octavio Medina

Julio Orozco

ENSTB / IRISA

TF-NGN meeting

Southampton, UK

18/04/2002


Af testing current status and perspectives

Current Status

  • What has been done:

    • Calibration of WRED

    • Calibration of TCM for TCP

  • What has been tested:

    • BW distribution among UDP flows

    • BW distribution among TCP aggregates

    • BW distribution TCP vs. UDP

  • What has been simulated

    • Individual TCP behavior

    • Aggregation

    • 2 level marking


Af testing current status and perspectives

Current Status

  • What’s missing


Af testing current status and perspectives

AF-Based Services

  • Until now, testing has focused in observing BW sharing among flows.

    • BW sharing under congestion not only depends on marking, but also on TCP behavior.

    • Difficult to imagine a large-scale service based on AF capacities.

  • AF offers priority-based packet drop in case of congestion.

    • Transport protocols don’t know how to take advantage of that.

    • A PHB for applications?


Af testing current status and perspectives

Perspectives

  • A service proposal may be imagined for CBR sources.

    • UDP multimedia flows

    • Shaped TCP aggregates ?

  • Tests & simulations for the CBR specific case can be specified.

    • Focus on Assured Bandwidth, forget BW sharing.

    • Concentrate on multi-layer multimedia needs?


Af testing current status and perspectives

Perspectives

  • Interest for an IP+ service has decreased

    • AF benefits are only seen under congestion.

    • Congestion not as frequent as before.

  • AF may be an alternative for LBE

    • Compare complexity to WRR.

    • Drawbacks related to delay.

  • Can AF improve ECN?

  • Any other possible use of AF?


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